Allegiant (NASDAQ: ALGT) and Viva Aerobus today announced plans for a fully-integrated Commercial Alliance Agreement, designed to dramatically expand options for nonstop leisure air travel between the United States and Mexico, while lowering fares to make travel more accessible and affordable for residents of both nations. The alliance is not only the first such venture for Las Vegas-based Allegiant and Viva Aerobus, but is also first-of-its-kind in the airline industry between two ultra low cos